how do u find the width of a rectangle if the length is 18 cm and the perimeter is 40 cm
perimeter = 2*length + 2*width
so:
40 = 2*18 + 2*width
40 = 36 + 2*width
subtract 36 from both sides
4 = 2*width
Divide both sides by 2
width = 2 (cm)
